Pneumatic jack



FIG. 1 is a front elevational view of a penumatic jack showing my new design;

FIG. 2 is a left side elevational view;

FIG. 3 is a top plan view;

FIG. 4 is a right side elevational view; and

FIG. 5 is a rear elevational view thereof, showing the jack in retracted condition. 

The ornamental design for a pneumatic jack, as shown and described. 